Mastervolt ALPHA PRO User Manual

Alpha Pro charge regulator – User and Installation Manual
25
ISSUE
POSSIBLE CAUSE
SOLUTION
Tachometer indication is too
low or fluctuates.
• An alternator driven tachometer
may reduce its reading or fluctuate
when the Alpha Pro makes a
transition from absorption to float if
the battery is fully charged with no
loads
Connect the W to the Alpha Pro. See
Figure 10.
• Engine speed is too low.
Increase engine speed.
• Wrong calibration of the
tachometer.
Adjust tachometer according to pulley
ratio.
Regulator stays in bulk
mode all the time (Bulk LED
stays on).
• Alternator is overloaded.
Switch off a load; (part off) consumers.
• Defective batteries, short-circuit
between cells.
Check batteries and replace if
necessary.
• Defective alternator
Check alternator and replace if
necessary.
• Capacity of the Alternator is too
low.
Use an alternator with more capacity or
increase charging capacity by using an
additional charger. Consult your
Mastervolt representative for advice.
Alpha Pro does not return to
bulk mode when a high load
is switched on
• Once the regulator is in absorption
mode a timer is started and after
this time the regulator switches to
float and will stay in this mode.
No action required. It will go back to Bulk
when the voltage drops below
12.8V/25.6V
Alternator is getting hot
while engine is not running
• Rotor field windings are still
excited while engine is not
running.
• Regulator is still on (bulk/abs/flo
led is on)
Switch off DC immediately to avoid field
windings of the alternator being
damaged due to overheating. Check the
oil pressure contact or ignition relay for
correct operation. This switch (S1) must
be open when the engine is not running.
Check wiring between battery and [reg
on] terminal.
Output voltage too high
• The regulator measures a too low
battery voltage and tries to
compensate it.
Check wiring between battery and [reg
on] terminal for corrosion. Check for
voltage drop across the oil pressure
switch (S1) (if applied). The line between
battery and [reg on] should not be used
by other loads.
• Wrong setting of the charge
voltage.
Adjust the charge voltage.
• Reg on is connected to the wrong
battery
Connect the reg on wire to the battery
being charged
• With non-Mastervolt alternators:
field terminal connected to the
field connection of the regulator
[D–] is not isolated from ground.
Check if field is isolated voltage on
terminal [D–] It should measure nominal
battery voltage. If this voltage is 0V,
check whether the terminal [D–] is
isolated from ground.
Charge voltage stays in
absorption mode too long /
too short
• Wrong setting of the absorption
timer.
Adjust the absorption timer (see section
MasterBus settings
Alpha Pro is in float mode,
but battery voltage is still at
absorption or bulk level
• Any other device is charging the
batteries.
Switch off all other charging devices and
check battery voltage again.

Mastervolt ALPHA PRO Specifications

General

Brand	Mastervolt
Model	ALPHA PRO
Category	Controller
Language	English